tropism

[ troh-piz-uh m ]
/ ˈtroʊ pɪz əm /
|

noun Biology.

an orientation of an organism to an external stimulus, as light, especially by growth rather than by movement.

Origin of tropism

First recorded in 1895–1900; independent use of -tropism

Related forms

tro·pis·mat·ic [troh-piz-mat-ik] /ˌtroʊ pɪzˈmæt ɪk/, adjectivetro·pis·tic [troh-pis-tik] /troʊˈpɪs tɪk/, adjective

Definition for tropism (2 of 2)

-tropism

variant of -tropy.

Origin of -tropism

see origin at -tropy, -ism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for tropism

British Dictionary definitions for tropism (1 of 2)

tropism

/ (ˈtrəʊpɪzəm) /

noun

the response of an organism, esp a plant, to an external stimulus by growth in a direction determined by the stimulus

Derived Forms

tropismatic, adjectivetropistic (trəʊˈpɪstɪk), adjective

Word Origin for tropism

from Greek tropos a turn

British Dictionary definitions for tropism (2 of 2)

-tropism

-tropy

n combining form

indicating a tendency to turn or develop in response to a certain stimulusphototropism

Word Origin for -tropism

from Greek tropos a turn
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for tropism (1 of 2)

tropism

[ trōpĭz′əm ]

n.

The turning or bending movement of a living organism or part toward or away from an external stimulus, such as light, heat, or gravity.

Related forms

tropic, tro•pistic adj.

Medicine definitions for tropism (2 of 2)

-tropism

suff.

Tropism:stereotropism.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for tropism

tropism

[ trōpĭz′əm ]

The growth or movement of a living organism or anatomical structure toward or away from an external stimulus, such as light, heat, or gravity. See also geotropism hydrotropism phototropism.

Related forms

tropistic adjective
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.